Unify button tooltips across the app (#972)

* feat(tooltip): 2s open delay and shared tooltipAttrs helper

Add a 2s hover open delay in TooltipPortal (single behaviour source) so
tooltips no longer flash on quick pointer passes; hiding stays immediate.
Add tooltipAttrs() to pair data-tooltip with a matching aria-label for
buttons touched in the unification work. Covered by Vitest.

* feat(tooltip): lower open delay to 1s

2s felt too long in testing; 1s gives the same anti-flash behaviour
without making intentional hovers wait.

* feat(tooltip): action tooltips on the artist overview

Add tooltips describing the action to Last.fm, Wikipedia, Play All,
Shuffle and Radio. Shuffle/Radio now show a tooltip on desktop too,
not just mobile. Strings added to all 9 locales.

* feat(tooltip): action tooltips on the album overview

Add tooltips describing the action to the desktop Play, Artist Bio and
Download (ZIP) buttons, matching the mobile layout. Strings added to all
9 locales.

* feat(tooltip): action tooltips on the All Albums toolbar

Add tooltips describing the action to the sort, year and genre filter
buttons. SortDropdown gains an optional tooltip prop; the year and genre
filter components carry their own, so the tooltips also appear on the
other browse pages that reuse them. Strings added to all 9 locales.

* feat(tooltip): action tooltips on song-list rows

Add Play and Add-to-queue tooltips to the per-row icons in SongRow, used
by the Tracks browse list, Search and Advanced Search. Also localizes the
aria-labels, which were hardcoded English. New common.addToQueue in all 9
locales.

* fix(tooltip): uniform tooltip placement on the Artists toolbar

The favourite and multi-select buttons forced tooltips below while the
view-mode buttons auto-flipped above, so the row looked inconsistent.
Pin the view-mode buttons below too, matching the rest of the row and the
Albums toolbar.

* feat(tooltip): clarify and align the Advanced Search scope row

Add a leading "Search in:" label and per-chip tooltips so the
All/Artists/Albums/Songs row reads as a scope limiter. Drop the forced
below-placement on the small star filter (used only here) so the
favourites chip flips with the others instead of sitting alone below.
Strings added to all 9 locales.

* docs(changelog): tooltip unification (#972)

src/components/SortDropdown.tsx

@@ -1,6 +1,7 @@
 import React, { useEffect, useLayoutEffect, useRef, useState } from 'react';
 import { createPortal } from 'react-dom';
 import { ArrowDownUp, Check } from 'lucide-react';
+import { tooltipAttrs } from './tooltipAttrs';
 
 export interface SortOption<V extends string> {
   value: V;
@@ -12,9 +13,11 @@ interface Props<V extends string> {
   options: SortOption<V>[];
   onChange: (value: V) => void;
   ariaLabel?: string;
+  /** Hover tooltip describing the action (shown below the trigger). */
+  tooltip?: string;
 }
 
-export default function SortDropdown<V extends string>({ value, options, onChange, ariaLabel }: Props<V>) {
+export default function SortDropdown<V extends string>({ value, options, onChange, ariaLabel, tooltip }: Props<V>) {
   const [open, setOpen] = useState(false);
   const [popStyle, setPopStyle] = useState<React.CSSProperties>({});
 
@@ -91,6 +94,7 @@ export default function SortDropdown<V extends string>({ value, options, onChang
         aria-haspopup="listbox"
         aria-expanded={open}
         aria-label={ariaLabel}
+        {...(tooltip ? tooltipAttrs(tooltip, { pos: 'bottom' }) : {})}
         style={{ display: 'flex', alignItems: 'center', gap: '0.4rem' }}
       >
         <ArrowDownUp size={14} />